Expansion unit for personal digital assistant



FIG. 1 is a top, front, and right side perspective view of an expansion unit for personal digital assistant according to my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a top rear and left side perspective view thereof. 

The ornamental design for an “expansion unit for personal digital assistant,” as shown and described. 